參數(shù)資料
型號: MC68HC705JJ7CDW
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: HCMOS Microcontroller Unit
中文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO20
封裝: SOIC-20
文件頁數(shù): 17/108頁
文件大?。?/td> 718K
代理商: MC68HC705JJ7CDW
Pin Functions
MC68HC705KJ1 MC68HRC705KJ1 MC68HLC705KJ1 Data Sheet, Rev. 4.1
Freescale Semiconductor
17
Figure 1-4. Crystal Connections with
Oscillator Internal Resistor Mask Option
Figure 1-5. Crystal Connections without
Oscillator Internal Resistor Mask Option
1.4.2.2 Ceramic Resonator Oscillator
To reduce cost, use a ceramic resonator instead of the crystal. The circuits shown in
Figure 1-6
and
Figure 1-7
show ceramic resonator circuits. Follow the resonator manufacturer’s recommendations, as
the resonator parameters determine the external component values required for maximum stability and
reliable starting. The load capacitance values used in the oscillator circuit design should include all stray
capacitances.
Mount the resonator and components as close as possible to the pins for startup stabilization and to
minimize output distortion. An internal startup resistor of approximately 2 M
is provided between OSC1
and OSC2 as a programmable mask option.
MCU
C1
C2
XTAL
C4
C3
XTAL
C3
27 pF
C4
27 pF
O
O
OSC1
OSC2
V
SS
V
DD
V
SS
MCU
C1
C2
R
XTAL
C4
C3
R
10 M
XTAL
C3
27 pF
C4
27 pF
OSC1
OSC2
V
DD
V
SS
O
O
V
SS
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